package com.ldx.callable;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class CallableTest {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
//    new Thread(new Runnable()).start();
//    new Thread(new FutureTask<V>()).start();
//    new Thread(new FutureTask<V>(Callable)).start();
        new Thread().start();//怎么启动Callable
        MyThread thread = new MyThread();
        FutureTask futureTask = new FutureTask(thread);//适配类

        new Thread(futureTask,"A").start();
        new Thread(futureTask,"B").start();//结果会被缓存，效率高

        //这个get方法可能会产生阻塞，把他放到最后或者使用异步通信来处理
        Integer o = (Integer) futureTask.get();//返回callable的接口
        System.out.println(o);
    }
}

class MyThread implements Callable<Integer> {

    @Override
    public Integer call() throws Exception {
        System.out.println("call()");//会打印几个call
        return 1024;
    }
}
